The accuracy of the optometry measured after dilating the pupils is high and there is usually no misdiagnosis, but dilating the pupils can lead to blurred vision and inaccurate vision itself. Dilated pupil optometry is generally used for children’s optometry, mainly because children’s adjustment ability is stronger, if not dilated pupils, the ciliary muscle adjustment can make the lens convex, refractive ability to enhance, can not rule out adjustable myopia, which is also known as pseudomyopia, thus making it difficult to identify the true myopia and pseudomyopia, which affects the accuracy of the optometry. Therefore, dilated optometry is generally used for children under 16 years of age who wear glasses for the first time, its accuracy is high, there is generally no misdiagnosis, after dilated pupils, patients will appear photophobia, difficulty in seeing things, tearing and other symptoms, these are temporary, after a period of time will be restored. These symptoms are temporary and will recover after a period of time. After dilating the pupils, the vision will be blurred, and the vision at this time does not represent the child’s own vision. After dilating the pupils, patients should try to avoid close-distance use of the eyes, such as reading, playing with cell phones, writing homework, etc. Because the pupil dilation during the period of dilation, the pupils will be dilated. Because the pupils dilate during dilation, patients also need to pay attention to sun protection of the eyes, avoid bright light stimulation, avoid ultraviolet damage to the eyes. It is recommended that patients follow the doctor’s instructions for care after pupil dilation, regular review, and timely consultation after discomfort occurs.